Manufacturing method of large-size welding type carburizing and quenching gear

A technology of carburizing and quenching and manufacturing methods, which is applied in the field of gear manufacturing, can solve problems such as low hardness, large heat treatment deformation, and waste of materials, and achieve the effects of eliminating forging stress, improving labor intensity, and ensuring weld quality

Inactive Publication Date: 2010-12-01
NANTONG ZHENHUA HEAVY EQUIP MFG
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Problems solved by technology

[0002] In the large reduction boxes of the main hoisting and luffing mechanisms in the 1600T floating crane, 4000T floating crane and 7000T floating crane, due to the relatively large modulus and diameter of the large gear, the diameter of the large gear is generally 2320mm and the thickness is 380mm. The weight is 5800kg. When manufacturing gears, if the monolithic blank is forged according to the traditional production method, the gears are hobbed after carburizing, quenching, grinding and other processes, which will not only waste materials, but also cause heat treatment due to insufficient quenching. The hardness is low, the heat treatment deformation is large, the cost is high, the yield is low, and it cannot be widely used

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  • Manufacturing method of large-size welding type carburizing and quenching gear
  • Manufacturing method of large-size welding type carburizing and quenching gear
  • Manufacturing method of large-size welding type carburizing and quenching gear

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specific Embodiment approach

[0018] Such as figure 1 , figure 2 , image 3 and Figure 4 A specific embodiment of the manufacturing method of the large-scale welded carburizing and quenching gear of the present invention is shown, comprising the following steps:

[0019] A. Selection of gear material: According to the large modulus and diameter of the large welded gear to be manufactured, 20CrNi2Mo is selected as the material of ring gear 1 and hub 2, and Q345 is selected as the material of sub-plate 3;

[0020] B. Determine the basic process route during the processing of ring gear 1, sub-plate 3, and wheel hub 2, and process them separately:

[0021] a. Carry out ring gear 1 processing: select ring gear forgings, normalize after forging, rough turn the two ends of the ring gear and the inner and outer circles of the ring gear, and leave a margin of 12-15mm for the length and diameter of the ring gear. Chamfering on both sides of the outer circumference, 100% ultrasonic flaw detection inspection, po...

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Abstract

The invention discloses a manufacturing method of a large-size welding type carburizing and quenching gear, comprising the following steps of: selecting gear material; determining the basic process routes when processing a gear ring, a subplate and a hub, and processing sperately; and integrally processing the gear. The manufacturing method has the advantages of reducing welding lobar intensity, improving production efficiency and ensuring the stability of welding quality.

Description

Technical field: [0001] The invention relates to a manufacturing method of a gear, in particular to a manufacturing method of a large welded carburizing and quenching gear. Background technique: [0002] In the large reduction boxes of the main hoisting and luffing mechanisms in the 1600T floating crane, 4000T floating crane and 7000T floating crane, due to the relatively large modulus and diameter of the large gear, the diameter of the large gear is generally 2320mm and the thickness is 380mm. The weight is 5800kg. When manufacturing gears, if the monolithic blank is forged according to the traditional production method, the gears are hobbed after carburizing, quenching, grinding and other processes, which will not only waste materials, but also cause heat treatment due to insufficient quenching. The hardness is low, the heat treatment deformation is large, the cost is high, and the yield is low, so it cannot be widely used. Invention content: [0003] The purpose of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/14
Inventor 任志华史伟民
Owner NANTONG ZHENHUA HEAVY EQUIP MFG
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